單項選擇題
A.4m/s B.3m/s C.2m/s
A.8 B.6 C.10
A.50 B.80 C.100
A.警沖標 B.停車標 C.鳴笛標
A.6 B.12 C.8
A.20 B.40 C.50
A.7 B.10 C.9
A.2 B.5 C.6
A.一級負荷 B.二級負荷 C.三級負荷
A.1 B.2 C.1.5
A.2 B.3 C.3.5